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.rm #[ #] #H #V #F C
.\" ========================================================================
.\"
.IX Title "C_REHASH 1"
.TH C_REHASH 1 "2016-09-22" "1.0.1u" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
c_rehash \- Create symbolic links to files named by the hash values
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
\&\fBc_rehash\fR
[ \fIdirectory\fR...]
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBc_rehash\fR scans directories and calculates a hash value of each \f(CW\*(C`.pem\*(C'\fR
file in the specified directory list and creates symbolic links
for each file, where the name of the link is the hash value.
This utility is useful as many programs that use OpenSSL require
directories to be set up like this in order to find certificates.
.PP
If any directories are named on the command line, then those are
processed in turn. If not, then the \fB\s-1SSL_CERT_DIR\s0\fR environment variable
is consulted; this shold be a colon-separated list of directories,
like the Unix \fB\s-1PATH\s0\fR variable.
If that is not set then the default directory (installation-specific
but often \fB/usr/local/ssl/certs\fR) is processed.
.PP
In order for a directory to be processed, the user must have write
permissions on that directory, otherwise it will be skipped.
The links created are of the form \f(CW\*(C`HHHHHHHH.D\*(C'\fR, where each \fBH\fR
is a hexadecimal character and \fBD\fR is a single decimal digit.
When processing a directory, \fBc_rehash\fR will first remove all links
that have a name in that syntax. If you have links in that format
used for other purposes, they will be removed.
Hashes for \s-1CRL\s0's look similar except the letter \fBr\fR appears after
the period, like this: \f(CW\*(C`HHHHHHHH.rD\*(C'\fR.
.PP
Multiple objects may have the same hash; they will be indicated by
incrementing the \fBD\fR value. Duplicates are found by comparing the
full \s-1SHA\-1\s0 fingerprint. A warning will be displayed if a duplicate
is found.
.PP
A warning will also be displayed if there are \fB.pem\fR files that
cannot be parsed as either a certificate or a \s-1CRL.\s0
.PP
The program uses the \fBopenssl\fR program to compute the hashes and
fingerprints. If not found in the user's \fB\s-1PATH\s0\fR, then set the
\&\fB\s-1OPENSSL\s0\fR environment variable to the full pathname.
Any program can be used, it will be invoked as follows for either
a certificate or \s-1CRL:\s0
.PP
.Vb 2
\&  $OPENSSL x509 \-hash \-fingerprint \-noout \-in FFFFFF
\&  $OPENSSL crl \-hash \-fingerprint \-noout \-in FFFFFF
.Ve
.PP
where \fB\s-1FFFFFF\s0\fR is the filename. It must output the hash of the
file on the first line, and the fingerprint on the second,
optionally prefixed with some text and an equals sign.
.SH "ENVIRONMENT"
.IX Header "ENVIRONMENT"
.IP "\fB\s-1OPENSSL\s0\fR" 4
.IX Item "OPENSSL"
The path to an executable to use to generate hashes and
fingerprints (see above).
.IP "\fB\s-1SSL_CERT_DIR\s0\fR" 4
.IX Item "SSL_CERT_DIR"
Colon separated list of directories to operate on.
Ignored if directories are listed on the command line.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBopenssl\fR\|(1),
\&\fBcrl\fR\|(1).
\&\fBx509\fR\|(1).